/**
 * 变量声名
 *    var let const 
 *    let name = 'jack'
 *    作用域
 *      全局作用域
 *      局部作用域
 *      块作用域
 */
let name = 'jack'
let age = 20
console.log(name, age);

if(true){
    let score = 90
    console.log(score);
}

const S1 = 3.1415926
// S1 = 32323

const obj = {
    name:'jack'
}

// obj = {}

obj.name = 'rose'